Zevalin With Non Myeloablative Allogeneic Stem Cell Transplantation in Patients With Non Hodgkin Lymphoma

Despite initial high response rates of low grade Non Hodgkin lymphoma, progressive or refractory disease currently remains incurable. Being a radiosensitive tumor, we hypothesize that combining different modalities of treatment including targeted radioimmunotherapy (RIT), and a graft versus lymphoma effect related to an allogeneic non myeloablative stem cell transplant may increase response and survival rates in a safe manner in patients with persistent disease following initial treatment. In this study patients who are not eligible for a standard stem cell transplant approach because of relapsed or refractory disease and who have a related sibling donor are treated with RIT followed by an allogeneic non myeloablative blood stem cell transplant